JP3364007B2 - Self-fusing insulated wire and rotating electric machine using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-fusing insulated wire having improved heat resistance and a rotating electric machine using the same.

[0002]

2. Description of the Related Art Self-fusing insulated electric wires, which have been conventionally used for coil molded products of various telecommunications equipment, have recently been able to be integrally fixed between wires without varnish impregnation treatment after coil winding. Streamlining the coil forming process of
With the demand for labor saving, the demand is increasing more and more.

This self-bonding insulated wire has a self-bonding layer mainly composed of a thermoplastic resin as the outermost layer of the wire. As the thermoplastic resin, a polyvinyl butyral resin or a copolyamide resin has hitherto been used. , Phenoxy resin, polyvinyl formal resin, polyester resin, epoxy resin and the like have been used.

However, in recent years, there is a demand for using such a self-bonding insulated electric wire as a coil for equipment such as motors and transformers used at high temperatures. However, as described above, the self-fusing insulated electric wire has a drawback that it is inherently poor in heat resistance because the fusion layer is softened and integrated by only heating. That is, in many conventional self-fusing insulated wires, the softening temperature of the fusion layer is as low as about 100 to 150 ° C. Therefore, when the temperature inside the equipment rises, the fusion layer softens and the adhesive strength decreases. As a result, there is a problem that the coil is deformed and the wire end is frayed.

On the other hand, as a means for preventing the decrease in the adhesive strength under such a high temperature atmosphere, a method using an aromatic polyester resin for the fusion bonding layer has been developed. However, this is not suitable for obtaining sufficient adhesive strength after coil forming.
It is necessary to heat at a high temperature of 250 ℃ or more for a long time,
In addition to poor workability, the main insulating layer may be deteriorated.

[0006]

As described above, in recent years, there has been a demand for a self-fusing insulated wire that can be used in a high temperature atmosphere, but most of the conventional ones have a low adhesive strength in a high temperature atmosphere. , Its use is difficult, and the one that prevents the decrease of adhesive strength under such a high temperature atmosphere needs to be heated at a high temperature for a long time in order to obtain a sufficient initial adhesive strength. However, there is a problem in that it causes deterioration and deterioration of the main insulating layer.

The present invention has been made in consideration of such conventional circumstances, and a self-bonding insulated electric wire which can be firmly bonded by heating at a low temperature and whose adhesive force is retained even at a high temperature, and An object is to provide a rotating electric machine using the same.

[0008]

The self-bonding insulated electric wire of the present invention is provided on a conductor directly or through another insulating layer.
(A) Polyethersulfone and (b) phenylenebisoxazoline dissolved in an organic solvent, or (b) polyethersulfone, (b) phenylenebisoxazoline, and (c) bismaleimide, polycyanate A coating material obtained by dissolving at least one selected from the group consisting of aromatic diamines and epoxy compounds in an organic solvent is applied and dried.

Further, the rotating electric machine of the present invention is characterized by comprising an insulating coil formed by winding the self-bonding insulated electric wire around the coil core and integrally heat-sealing the same.

Further, another rotating electric machine of the present invention is a rotating electric machine which is directly connected to a main shaft of an internal combustion engine of an automobile to perform electric braking and auxiliary acceleration of the automobile, wherein the self-welding insulation is provided on a coil core. It is characterized in that it is provided with an insulating coil formed by winding an electric wire and heat-sealing it integrally.

The polyether sulfone which is the component (A) used in the present invention is represented by the following general formula having an average molecular weight of 10,000 or more.

[0012]

[Chemical 1] (However, in the formula, n is a positive integer.) Examples of commercially available products include Victorex PES manufactured by Mitsui Toatsu Chemicals, Victorex PES manufactured by Sumitomo Chemical,
US I. C. Victrex PES 200P and PES manufactured by I company
Examples include 300P (all above are product names).

The phenylenebisoxazoline component (B) is represented by the following chemical formula.

[0014]

[Chemical 2] Examples of commercially available products include 1,3 manufactured by Takeda Pharmaceutical Company Limited.
-PBO (brand name) and so on.

The bismaleimide as the component (c) is represented by the following general formula, and it is preferable that x is a --CH ₂ --group.

[0016]

[Chemical 3] (However, in the formula, x is -O-, -S-, -SO ₂ -or -CH _2- .) Commercially available products include, for example, BMI manufactured by Mitsui Toatsu Chemicals, Inc.
(Product name) and so on.

Examples of polycyanates include bisphenol A dicyanate, and trimers, pentamers, and heptamers thereof. Of these, bisphenol A dicyanate is preferable. Examples of commercially available products include B manufactured by Mitsubishi Gas Chemical Co., Inc. as a mixture with the above-mentioned bismaleimide.
Examples include T resin (trade name).

As the aromatic diamine, 4,4'-
Diaminodiphenylmethane (DAM), 4,4'-diaminodiphenylpropane, 4,4'-diaminodiphenyl ether, benzidine, 4,4'-diaminodiphenyl sulfide, 3,3'-diaminodiphenyl sulfone, 4,4 '
-Diaminodiphenyl sulfone, m-toluylenediamine, m-phenylenediamine, p-phenylenediamine,
Examples thereof include 2,6-diaminopyridine and bis (4-aminophenyl) diethylsilane. Among them, 4,4′-diaminodiphenylmethane is preferable. To exemplify commercial products,
For example, there is MDA-220 (trade name) manufactured by Mitsui Toatsu Chemicals, Inc., and Kelimide 601 (trade name) manufactured by Ciba-Geigy Co. is a mixture of bismaleimide and DAM.

Further, the epoxy compound is preferably one having at least two epoxy groups in the molecule, and for example, a bisphenol A type epoxy resin or the like is used. Examples of commercially available products include, for example, Epicoat 1007 (trade name) manufactured by Shell Co., and Epitote manufactured by Toto Kasei Co., Ltd.
YB-017 (trade name) and so on.

Bismaleimide as the component (C),
The polycyanate, aromatic diamine, and epoxy compound may be used alone or in combination of two or more.

The above-mentioned phenylene bisoxazoline (b) has an effect of relaxing heating conditions for fusion. That is, although the polyether sulfone of (a) alone has excellent adhesive strength at high temperature, heating at high temperature is required for fusion bonding. However, by blending the (b) phenylenebisoxazoline, it becomes possible to perform fusion bonding at a low heating temperature, and further, the adhesive force at a high temperature is not lowered. Further, the phenylenebisoxazoline (b) also has the effect of improving the flexibility of the coating film. That is, the polyether sulfone of (a) is changed to (b)
The coating composition containing phenylenebisoxazoline can form a coating film which can be fused at a low heating temperature and has excellent heat resistance and flexibility. Furthermore, by blending the component (c) with the components (a) and (b), the adhesive strength at high temperature can be further increased. The component (c) also has the effect of relaxing the heating conditions for fusing, and by blending with the polyether sulfone of (a), fusing can be performed without lowering the adhesive strength at high temperatures. Although the conditions can be relaxed, the flexibility of the coating film becomes somewhat insufficient.

The compounding amount of phenylenebisoxazoline as the component (b) for obtaining the above-mentioned effect is 2 to 300 parts by weight, and more preferably 5 to 300 parts by weight, per 100 parts by weight of the polyether sulfone as the component (a). It is 200 parts by weight. Also,
When the component (c) is mixed, per 100 parts by weight of the polyether sulfone of the component (b), the phenylenebisoxazoline of the component (b), the bismaleimide and the polycyanate of the component (c), the aromatic The total amount of at least one selected from the group of diamines and epoxy compounds is 2 to 300.
The mixing ratio of the component (b) and the component (c) is in the range of 1:49 to 49: 1 by weight. More preferably, the total amount of the component (b) and the component (c) is in the range of 5 to 200 parts by weight per 100 parts by weight of the component (a),
The mixing ratio of the component (b) and the component (c) is 1:19 by weight.
It is in the range of ~ 19: 1.

As the organic solvent for dissolving or dispersing the above components, phenol-based solvents such as cresol, xylenol and phenol, nitrogen-containing solvents such as N-methyl-2-pyrrolidone, dimethylacetamide (DMAC) and dimethylformamide. Solvents, cyclohexanone, methylethylketone, methylhexanone, ketone solvents such as acetophenone, methylcarbitol, carbitol, methylcellosolve acetate, methylcellosolve,
Examples include alcohol solvents such as isopropylbenzyl alcohol, hydrocarbon solvents such as benzene, xylene, toluene, solvent naphtha, etc. These may be used alone or in combination of two or more. May be.

In the self-fusing insulated electric wire of the present invention, the coating composition prepared by dissolving the components (a) and (b) or the component (c) in the organic solvent is directly applied onto the conductor. Alternatively, it can be obtained by applying via another insulating layer and heating and drying. A heating temperature of about 250 to 450 ° C is suitable, and the component (b) or the component (b) and the component (c) react to obtain these low molecular weight polymers, and the semi-cured coating is obtained. A film is formed.

When provided via another insulating layer, the other insulating layer is formed by applying a coating material for an insulated wire on the conductor and baking it until it is completely cured. As the insulated wire coating material, one having excellent heat resistance is preferable, and in addition to known coating materials such as formal resin, epoxy urethane resin, polyester resin, polyesterimide resin, polyamideimide resin, and polyimide resin, the above fusion layer formation A paint for use is preferably used.

The self-bonding insulated electric wire of the present invention thus obtained is, after coil forming, at a temperature of about 150 to 240 ° C. (generally, a temperature range of 150 to 200 ° C. is sufficient).
The surface is softened by heating for 20 to 30 minutes, and they are fused together with sufficient strength. And, the adhesive strength does not significantly decrease even at high temperature.

As described above, the self-fusing insulated electric wire of the present invention is firmly fused by heating at a relatively low temperature, and has excellent adhesive strength even at a high temperature. Therefore, heat resistance is required. Applications, such as transformer coils, coils for rotating electrical machines of heat-resistant equipment, etc., applications where extremely severe heat cycles are applied, such as coils for rotating electrical machines for electric braking and auxiliary acceleration of automobiles. It is also applicable to.

[0028]

As described above, in the self-fusing insulated electric wire of the present invention, the fusing layer has a polyether sulfone and phenylene bisoxazoline, or a polyether sulfone and phenylene bisoxazoline, and bismaleimide, polycyanate, Since it is formed by applying and drying a paint mainly containing one or more selected from the group of aromatic diamines and epoxy compounds, it can be fused by heating at a relatively low temperature, and It also has excellent adhesive strength at high temperatures. Further, since it has good flexibility, it has excellent winding property.

Further, since the rotating electric machine of the present invention uses the above-mentioned self-bonding insulated wire, it is excellent in heat resistance and can be used for electric braking and auxiliary acceleration of a vehicle subjected to a severe heat cycle. As a rotating electric machine of the device to perform,
Can withstand practical use.

[0030]

EXAMPLES Examples of the present invention will be described below. Examples 1-14 Polyethersulfone Victrex PES, phenylene bisoxazoline 1,3-PBO, and bismaleimide
BMI, BT resin mixed with bismaleimide and bisphenol A dicyanate of polycyanate, Kelimide 601 mixed with bismaleimide and DAM of aromatic diamine, Epicoat 1007 of epoxy compound, and DAM and MDA of aromatic diamine Using -220, these were dissolved in an organic solvent DMAC to prepare various paints having the compositions shown in Table 1. Next, each of these paints was applied to a 0.3mmφ polyesterimide wire (0.3mmφ copper wire coated with 20μm of polyesterimide paint and baked), and a DV value (wire Diameter x linear velocity) 18
~ 21, temperature 320 ~ 370 ℃
A self-bonding insulated electric wire of μm was obtained.

Next, the flexibility of the obtained self-fusion-bonded insulated wire and the adhesive strength under normal temperature and high temperature atmosphere were measured. Flexibility was measured in accordance with JIS C 3003, and when three test pieces with a length of 35 cm were taken from the same reel and each was stretched at a pulling speed of 300 mm / min or less with a marked line distance of 250 mm. The self-bonding layer was examined for cracks with a 15x magnifying glass. The adhesive strength is measured according to ASTM D-2519, and the self-fusing insulated wire is first wound around a mandrel with a diameter of 5 mm to create a helica coil with a length of about 70 mm.
For samples that were heated at 160 ℃, 180 ℃, 200 ℃, and 220 ℃ for 30 minutes, at room temperature, the distance between fulcrums is 44.4mm,
A bending test was performed at a speed of 20 mm / min to measure the adhesive strength at room temperature under each fusion bonding condition. In addition, a helix coil prepared in the same way was heated for 30 minutes at a temperature of 200 ° C, and a bending test was performed under the same conditions as at room temperature in an atmosphere of 120 ° C, 140 ° C, 160 ° C, and 180 ° C. The adhesive strength in a temperature atmosphere was measured. The results are shown in Tables 1 and 2.

In Table 2, as a comparative example,
Comparative Example 1 is an example in which only polyether sulfone is applied and baked on a polyesterimide wire, and Comparative Example 2 is a paint prepared by blending only polyether sulfone with BT resin and dissolving it in an organic solvent. Examples and Comparative Example 3 are phenoxy resin paint ISOPOXY 506K
(Nippon Schenectady Co., Ltd. product name) is applied independently. An example of a self-bonding insulated wire baked and baked is Comparative Coat polyamide resin paint TCV-U2 (Tokushu Paint Co., Ltd. product name). An example of a baked self-bonding insulated wire, and Comparative Example 5 is an example of a self-bonding insulated wire in which aromatic polyester resin paint U-100 (trade name of Unitika Ltd.) is applied and baked alone. It is shown for comparison with the present invention. The adhesive strength of Comparative Examples 3 to 5 was 180
Measurements were performed on the materials that were heat-fused at 10 ° C for 10 minutes, 180 ° C for 10 minutes, and 250 ° C for 30 minutes.

[0033]

[Table 1]

[Table 2] As is clear from these tables, the self-fusing insulated electric wire of the present invention has a sufficient adhesive force even under a low temperature fusing condition, and is also excellent in the adhesive force at high temperature. There is.
It also has good flexibility.

Next, a rotating electric machine was produced using the obtained self-bonding insulated electric wire of each of the above-mentioned examples. That is, on the iron core laminated magnetic steel sheet, wound through a predetermined slot insulation made of aramid paper and polyimide film,
It heated at 230 degreeC for 2 hours, and fused between the wires integrally.

Subsequently, the rotary electric machine thus produced was mounted as a rotary electric machine of an electric braking and auxiliary accelerating device for performing electric braking and auxiliary acceleration of an automobile, and its performance was tested. It was confirmed to be a thing.

Further, the above-mentioned rotating electric machine was incorporated into a simulator which constituted the internal combustion engine of the automobile by a motor, and the following simulated running test of the automobile was conducted. That is, the AC motor drives the motor at a rotation speed that depends on the frequency of the commercial power supply, and the temperature of the thermocouple attached to the coil is 200 ℃ in the power generation mode.
Power generation until it reaches 200 ℃
After cooling to room temperature, the power cycle was repeated again, and the heat cycle of 200 ° C → normal temperature → 200 ° C was repeated at the frequency of the actual automobile heat cycle. In this application, since the rotating electric machine is generally controlled by the inverter, a commutation surge voltage generated by the inverter is added to the normal voltage, which is actually a severer condition for the insulating film. Therefore, in this simulated running test as well, an inverter was used to implement these actual conditions. The result is that no matter what rotating electric machine is used, no abnormalities in insulation are observed in this severe operation test, and even in the dielectric breakdown test after the test, the dielectric breakdown voltage is line-to-line, phase-to-phase, Between the ground and the voltage applied during operation
It was more than four times stronger.

[0037]

As described above, according to the present invention,
Since it can be fused at a low temperature, it has excellent workability and does not deteriorate the main insulating layer during processing,
In addition, it is possible to provide a self-fusing insulated electric wire that also has excellent adhesive strength at high temperatures. Therefore, it is possible to realize an application requiring heat resistance and heat cycle resistance, for example, a rotating electric machine used for electric braking and auxiliary accelerating devices of automobiles, by using the self-fusing insulated electric wire.

[0038]

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification FI H01B 3/30 H01B 3/30 MH02K 15/12 H02K 15/12 C // H02K 3/32 3/32 (72) Inventor Kazuo Shimohira 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Showa Electric Cable Denki Co., Ltd. (72) Inventor Mitsui Hisan 4-share company, Toshiba Keihin Plant, 2 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa (56) References JP-A 62-91556 (JP, A) JP-A 50-52580 (JP, A) JP-A 52-31393 (JP, A) JP-A 7-122120 (JP, A) (58) Survey Fields (Int.Cl. ⁷ , DB name) H01B 7/02 C09D 163/00 C09D 171/10 C09D 179/00 C09D 181/06 H01B 3/30 H02K 15/12 H02K 3/32

Claims (6)

(57) [Claims] 1. A coating obtained by dissolving (a) polyether sulfone and (b) phenylenebisoxazoline in an organic solvent is applied directly to a conductor or through another insulating layer and dried. A characteristic self-bonding insulated wire. 2. (a) Polyether sulfone, (b) phenylene bisoxazoline, and (c) bismaleimide, polycyanate, aromatic diamine and epoxy compound directly on the conductor or through another insulating layer. A self-bonding insulated electric wire, characterized by being formed by applying a coating material prepared by dissolving at least one selected from the group in an organic solvent and drying it. 3. A rotating electric machine comprising: an insulating coil formed by winding the self-bonding insulated electric wire according to claim 1 on a coil core and integrally heat-sealing the same. 4. An electric rotating machine comprising: an insulating coil formed by winding the self-bonding insulated electric wire according to claim 2 on a coil core and heat-sealing them together. 5. A rotary electric machine that is directly connected to a main shaft of an internal combustion engine of an automobile to perform electric braking and auxiliary acceleration of the automobile, wherein the self-fusing insulated electric wire according to claim 1 is wound around a coil core to be integrated. An electric rotating machine, comprising: an insulating coil formed by heat-sealing. 6. A rotary electric machine that is directly connected to a main shaft of an internal combustion engine of an automobile to perform electric braking and auxiliary acceleration of the automobile, wherein the self-bonding insulated electric wire according to claim 2 is wound around a coil core to be integrated. An electric rotating machine, comprising: an insulating coil formed by heat-sealing.